//=-------------------------------------------------------------------------=//
//  Main                                                                     //
//                                                                           //
//  Copyright © 2021 The Gem-graph Project                                   //
//                                                                           //
//  This file is part of gem-graph.                                          //
//                                                                           //
//  This program is free software: you can redistribute it and/or modify     //
//  it under the terms of the GNU Affero General Public License as           //
//  published by the Free Software Foundation, either version 3 of the       //
//  License, or (at your option) any later version.                          //
//                                                                           //
//  This program is distributed in the hope that it will be useful,          //
//  but WITHOUT ANY WARRANTY; without even the implied warranty of           //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            //
//  GNU Affero General Public License for more details.                      //
//                                                                           //
//  You should have received a copy of the GNU Affero General Public License //
//  along with this program.  If not, see <https://www.gnu.org/licenses/>.   //
//=-------------------------------------------------------------------------=//

#include "../include/base.h"
#include "../include/server.h"
#include "../include/model.h"

/* -------------------------------------------------------------------------- */

static Server_t *server;

static void SigIntTermHandler(int signum)
{
    server->pleaseStop = true;
    printLog("Server stopping\n");

    ModelShutdown();
    printLog("All model shutted down\n");
}

// TODO parse args to discover :
//      - config files directory
//      - models & users directories
int main(int argc, char **argv)
{
    int options;
    time_t t;
    int returnValue = 0;
    Parameters_t *parameters;

    // Get parameters TODO from args
    parameters = (Parameters_t*) calloc(sizeof(Parameters_t), 1);

    while ((options = getopt(argc, argv, ":C:M:U:")) != -1) {
        switch (options) {
        case 'C':
            printLog("Config : %s\n", optarg);
            parameters->configDir = (char*) malloc(strlen(optarg) + 1);
            strcpy(parameters->configDir, optarg);
            break;
        case 'M':
            printLog("Models : %s\n", optarg);
            parameters->modelDir = (char*) malloc(strlen(optarg) + 1);
            strcpy(parameters->modelDir, optarg);
            break;
        case 'U':
            printLog("User : %s\n", optarg);
            parameters->userDir = (char*) malloc(strlen(optarg) + 1);
            strcpy(parameters->userDir, optarg);
            break;
        case ':':
            printLog("Option missing argument : %c\n", optopt);
            if (parameters->configDir)
                free(parameters->configDir);

            if (parameters->modelDir)
                free(parameters->modelDir);

            if (parameters->userDir)
                free(parameters->userDir);

            free(parameters);
            return ENOSYS;
            break;
        case '?':
            printLog("Unknown option : %c\n", optopt);
            if (parameters->configDir)
                free(parameters->configDir);

            if (parameters->modelDir)
                free(parameters->modelDir);

            if (parameters->userDir)
                free(parameters->userDir);

            free(parameters);
            return ENOSYS;
            break;
        }
    }

    if (!parameters->configDir | !parameters->modelDir | !parameters->userDir) {
        printLog("Missing arguments\n");

        if (parameters->configDir)
            free(parameters->configDir);

        if (parameters->modelDir)
            free(parameters->modelDir);

        if (parameters->userDir)
            free(parameters->userDir);

        free(parameters);
        return ENOSYS;
    }

    // Go!
    printLog("Starting gem-graph-server...\n");

    // Register new interrupt handler
    signal(SIGINT, SigIntTermHandler);
    signal(SIGTERM, SigIntTermHandler);

    // Initializing random generator
    t = time(&t);
    srand((unsigned) t);

    server = (Server_t*) calloc(1, sizeof(Server_t));

    // Initializing model system
    ModelSystemInit(parameters);

    // Launching server
    ServerInit(server);

    // Waiting for termination
    ServerWait(server);

    // Exiting
    returnValue |= server->returnValue;
    ModelSystemDestroy();
    free(server);
    server = NULL;

    free(parameters->userDir);
    free(parameters->modelDir);
    free(parameters->configDir);
    free(parameters);
    parameters = NULL;

    return returnValue;
}